APA

Bierhorst D. W., . (1971). Morphology of vascular plants. New York: Macmillan.

Chicago

Bierhorst David W, . 1971. Morphology of vascular plants. New York: Macmillan.

Harvard

Bierhorst D. W., . (1971). Morphology of vascular plants. New York: Macmillan.

MLA

Bierhorst David W, . Morphology of vascular plants. New York: Macmillan. 1971.